Using <Wind Chasing Steps> made Duncan's speed increase twofold. The real effects of <Wind Chasing Steps> were only visible when travelling long distances. While using the technique could increase mobility in short distances, the increase in speed wasn't anything impressive. However, if it was travelling in a straight line for long distances, then <Wind Chasing Steps> truly shined.
Duncan travelled at his maximum speed intending to put some distance between him and the site of his battle as soon as possible. After travelling for some time, Duncan came across another pathway leading to multiple tunnels.
Duncan felt his head ache looking at the myriad of tunnels that were leading in different directions. He figured that there was a complex system of tunnels running throughout the mountain. And the cave was apparently the entrance to this whole system.